• Topic ID: id_11038812
  • Version: 3.0
  • Date: Apr 9, 2020 8:50:05 PM

Slipring Transmitter (850 Mbaud) Replacement

Prerequisites

This procedure describes the Slipring Transmitter replacement.

Procedure

  1. Move table to its lowest elevation.
  2. Remove gantry covers as required.

    Refer to Parts Replacement > Gantry > Enclosure > (Cover Removal Procedure).

    3. Notice Image
    • notice
    • Always turn OFF the HVDC before the 120 VAC. Turning OFF 120 VAC power before HVDC power can result in equipment damage.
  3. Turn OFF all 3 service switches (Axial Drive, HVDC, 120VAC) on the Service Switch Panel. Follow Lockout/Tagout procedures.
  4. The transmitter is located on the back of the slipring. Locate it by rotating gantry.
    5. Notice Image
    • notice
    • Slip Ring Contamination Possible. Be careful to not contaminate slipring or signal.
  5. Remove J1 and J3 cables.
  6. Using a 2.5mm hex key, remove screws holding the transmitter to the slipring.

    Figure 1. 850 MBaud Slipring Transmitter

  7. Replace transmitter.

Finalization

  1. Hardware Reset
  2. Acquire 10 scouts: (120kV/40mA, 1000mm table movement)
  3. Acquire 100 axials: (120kV/80mA, 0.5 sec. Scan)
  4. Acquire 1 helical: (120kV/40mA, 30 sec. Scan),
  5. Acquire 10 axial scans: (120kV/400mA, 4 sec. Scan)
  6. Verify NO increase in corrected or uncorrected FEC errors.
  7. Reset DIP Stats: Perform the following procedure to reset cumulative DIP Stats (shown on the Common Service Desktop Home Page):
    1. Open a Unix shell.
    2. Type: cd /usr/g/service/log
    3. Type: mv dip.stats dip.stats.old
    4. Shutdown and restart the system. This will reinitialize the dip.stats file.
    5. Save System State.